When the Toronto Blue Jays made their somewhat surprising move to add Russell Martin, they didn't just weaken the free-agent catching market. They decimated it. Sure, you could probably piece together a decent backup from guys like Geovany Soto, Nick Hundley or David Ross, but there's no one close to being a full-time starter. Of the remaining free agents, there's not a single one who's even projected to manage even a lowly .300 OBP in 2015, according to Steamer projections.
That's a considerable problem for some of the other teams that were expected to be heavily interested in Martin, like the Chicago Cubs and Los Angeles Dodgers, because their paths forward are less clear now. In Los Angeles, A.J. Ellis is better than his .191 batting average would indicate, but he's also nearly 34 and coming off several serious leg injuries. The Cubs might need to stick with Welington Castillo, who's coming off a poor season. The Pirates will replace Martin with a trio of catchers more suited to be backups; the current Rangers starter is 30-year-old Robinson Chirinos, who has less than a full season of major league play under his belt.
It's not a good time to be looking for a catcher, is the point, and the main trade options being talked about come with questions of their own.